Session is already locked.

[Mikael Nilsson]

Why do I get this error?

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Exception message  : Session is already locked.
Session ID is invalid.
Exception class    : ESessionAlreadyLocked
Session ID        : ZYk2A1GFjwfY91jjTz9VpYFXpYe
Exception address  : 06490640
Exception Time    : 2019-11-08 13:35:56.691
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Application Name  : isapiXIBwwd.dll
Application Version: 1.0.0.0
Started at        : 2019-11-08 12:32:01.810
Running for        :  1 hour 3 minutes 54 seconds
Computer Name      : P-W-WWD-WEB01
Compiler Version  : 330
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IntraWeb Version  : 15.1.7
Multi-session      : False
Content Path      : D:\Inetpub\wwwroot\kundzon.itella.se\wwd\wwwroot\
Session count      : 724
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Client IP address  : 10.163.65.1
Request PathInfo  : /$/callback
Request Method    : POST
Request User Agent : Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36
Cookies Count      : 1
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(0034F63B){isapiXIBwwd.dll} [0649063B] Unknown function at TMethodImplementationIntercept + $2DC82F
(0034EBD4){isapiXIBwwd.dll} [0648FBD4] Unknown function at TMethodImplementationIntercept + $2DBDC8
(0033D174){isapiXIBwwd.dll} [0647E174] Unknown function at TMethodImplementationIntercept + $2CA368
(0033D6F4){isapiXIBwwd.dll} [0647E6F4] Unknown function at TMethodImplementationIntercept + $2CA8E8
(0034B667){isapiXIBwwd.dll} [0648C667] Unknown function at TMethodImplementationIntercept + $2D885B
(00337F1C){isapiXIBwwd.dll} [06478F1C] Unknown function at TMethodImplementationIntercept + $2C5110
(00337D30){isapiXIBwwd.dll} [06478D30] Unknown function at TMethodImplementationIntercept + $2C4F24
(0035040C){isapiXIBwwd.dll} [0649140C] Unknown function at TMethodImplementationIntercept + $2DD600
(003506C4){isapiXIBwwd.dll} [064916C4] Unknown function at TMethodImplementationIntercept + $2DD8B8
(00009EF8){isapiXIBwwd.dll} [0614AEF8]

[Alexandre Machado]

This is not an error. It is a (handled) exception that IW raises to break a second request targeting the same session.

Let's say you have a button in your form which triggers a long lasting process, for instance a long report. Let's say it takes 2 minutes to generate the report.
After 30 seconds waiting the user decides to press ENTER in the address bar (thinking that it will make it generate the response faster....). This will trigger another request to the same session. But the session is busy generating the response for the first request. After (Default time) 30 seconds IW will break this request. You can control this timeout via ServerController.SessionOptions.LockSessionTimeout. You can increase the value if you wish.

I've noticed that you don't have a stack trace on your error log.

Please refer to this document : http://docs.atozed.com/docs.dll/developm...ogger.html

Double check if Debug information is checked in both COMPILER AND LINKER options!